molean



(No Model.) 4 Sheets-Sheet 2.

c. W. MOLEAN.

MANUPACTURE 0F COLUMNS, POSTS, 6m., 0F GLASS.

@ '1 a a N lm fi l Hl y. y.. s. 1,2910.

jvglz. 1527.12.

WITNESSES 1N VEA/Toba 4 Sheets-Sheet 3.

um Model.)

C. W. MGLEAN.

MANUPAGTURB 0F SULUMNS, POSTS, Se., 0F GLASS.

No. 250,933. Patented Deo. 13,1881.

WI TJVESSES g JM f2.5 .dttorney N. PETERS. Prwlwllhomphwr. washington. D. C.

(No Model.)

C. W. MGLEAN.

4 Sheets-Sheet 4.

MANUPAGTURE OF COLUMNS, POSTS, &G., 0F GLASS.

Patented Deo. 13, 1881.

WITNESS JM N. PETERS. Pvwtwuhognpmr. washing ILC.

UNITED STATES PATENT OFFICE.

CHRISTOPHER YV. MGLEAN, OF NEW BERNE, N. C.

MANUFACTURE OF COLUMNS, POSTS, 84C., OF GLASS.

SPECIFICATION forming part of Letters Patent No. 250,933, dated December 13, 1881.

Application led October 4, 1881. (No model.) I

To all whom it may concern:

Be it known that I, CHRISTOPHER W. Mc- LEAN, a citizen of the United States of America, residing at New Berne, in the county of Graven and State of North Carolina, have invented certain new and useful Improvements in the Manufacture of Columns, Posts, 85e., of Glass; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the Asame,ret`erence being had to the accompanying drawings, and to letters or figures of reference marked thereon,which form a part of this specitication.

Figure 1 is a vertical sectional view ot' a mold for casting solid bodies of glass. Fig. 1f is a plan View on the line a' x of Fig. 1. Fig. 2 is a vertical sectional view of a mold for casting articles of glass with perforations or mortises therein. Fig. 2 is a plan view on the line w x of Fig. 2. Figs. 3, 4, 5, and 6 are views in perspective of columns or posts. Figs. 7, 8, 9, and l0 are plan views on the lines y y of Figs. 3, 4, 5, and 6, respectively. Figs. l1 and 12 are plan views of sexagonal and octagonal columns or posts. Fig. 13 is a view in perspective of a column for buildings or other purposes. Fig. 14 is a view in perspective on the line y y. Fig. 15 is a viewin perspective of a bitching-post or other ornamental articles. Fig. 16 is a view in perspective of a solid telegraph-pole, according to my invention. Fig. 17 is a cross-section of Fig. 16. Fig. 18 is a view in perspective of a hollow telegraph-pole, and Fig. 19 a cross-section of the same.

The object of my invention is the production of solid bodies ot' glass-such as columns for architectural purposes, posts for fences and other purposes, hitching-posts of all varieties and of varied configurations, telegraph-poles, &c.-and in annealing the same while in the mold in which they are cast, so as to be unaffected by thermal changes.

Referring to the drawings, A indicates the mold, provided with a heating-chamber, a, and mounted on a suitable base, which will retain the molten metal within the mold.

The article C, cast as shown in the mold, is a fencepost having circumferential grooves extending around the same at intervals, and is specially adapted for wire or barbed fences.

In Fig. 2, I have shown a mold having cores b, or division-pieces extending across the cavit y in which the article is formed, so as to produce holes or mortises therethrough, the finished article being more fully shown in Fig. 5, and is specially adapted for posts, for bars, and in what is known as post-and-rail fences.7

The mold, as shown in Fig. 2, is separable near one side, so that the cores b may be readily withdrawn from the article when the casting and annealing process has been completed. The molds being closed and placed 1n position are heated by the introduction of caloritic currents through the tubes c into the heatingchamber a. The molten glass is then poured into the mold and allowed to cool gradually, so that when the article is withdrawn from the mold it is annealed or toughened, and will withstand the various climatic changes without injury.

I do not limit myself to. metal molds in the manufacture of fence-posts, telegraph-poles, and such like articles, as sand molds, such as are used in metal founding, can be used to advantage, especially what is known as the drysand mold.77 When the sand mold is used the mold, with the article therein, can be placed iu a furnace, or in what is known as a pot-arch, and allowed to remain until properly annealed.

The style or form of posts herein shown isV simply given as the forms most desirable in casting; but I do not wish to limit myself to any particular form.

The glass used in the manufacture of such articles as fence-posts, unless intended for ornamental purposes, may be composed of the coarser ingredients, and may be colored in any shade or in a variety of shades. producing such articles in glass of a coarse character will be no greater than cast-iron and far more durable, for the reason that iron will rust and corrode and soon .become worthless when exposed continually to moisture in the ground, but glass remains unaffected and is impervious to moisture. Other advantages might be set forth in favor of glass for an interminable variety of solid articles, the most important of which is that it can be produced in any desired form or ornamentation.

The cost of I IOO I am aware that columns for architectural purposes have been made of glass, and such I do not claim.

Having thus described my invention, what 5 I claim is'- 1. As an improvement in the art of manufacturing columns, posts, poles, and other analogous articles of glass, the process herein described of casting the samein heated molds and 1o allowing the article to remain in the mold and subjected to heat until properly annealed, as set forth.

2. As a. new article ot' manufacture, a fencepost or telegraph-pole made of glass.

In testimony whereof I afx my signature 15 in presence of two Witnesses.

CHRISTOPHER W. MCLEAN. Witnesses:

A. H. Bn'rz, T. C. BRECHT. 

